Self-sinking Diffuser AD-9Product Highlights: High efficiency fine bubble diffuser with low back pressure Precise contoured diffuser plate designed for the membrane (automatic closes the fine openings when no air flow no blockage or maintenance needed) Built in check valve the diffuser plate will shut off water back flow Unique Advanced self sinking design (patent pending) High profile base plate extruded four corner supports prevent muck coverage onto diffuser Portable Top
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